Directives

sub_filter

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sub_filter allows replacing some text in the nginx response with some other text, independently of the source of the data. The matching is case-insensitive. Substitution text may contain variables. Only one substitution rule per location is supported.

sub_filter_once

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sub_filter_once off allows to search and replace all matching lines, the default is replacing only the first one.

sub_filter_types

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sub_filter_types is used to specify which content types should be checked for sub_filter. The default is only text/html.